JP7418885B1 - filtration system - Google Patents

Abstract

An object of the present invention is to be able to wrap a filtration material around the rotating drum of a filtration unit and a backwashing unit almost all the way around the entire circumference, thereby obtaining a filtration capacity twice as large as the conventional wrapping angle. [Solution] When a filter material F is wound around a first rotary drum 12 that allows flow between the inside and outside of a first tank 11 and is run, a liquid to be treated is introduced to the outside and the liquid level is adjusted by the first rotation. There is a filtration unit 10 that is placed above the drum 12 and creates a negative pressure inside the rotating drum so that the liquid to be treated flows through the filtration material F and solids are captured by the filtration material F. It is equipped with a backwashing unit that turns the filter medium F upside down and wraps it around the second rotating drum 22 to remove solid matter from the filter medium F and regenerate the filtering function. F is wound around almost the entire circumference of the rotating drum, and closing members 15 and 25 are provided on the inner surface of the rotating drum to prevent liquid from entering the rotating drum. [Selection diagram] Figure 3

Description

The present invention relates to a filtration system capable of removing solid and oily impurities from aqueous liquids.

During grinding using a grinding machine tool such as a grinder that uses a grindstone to sharpen steel, a coolant liquid is supplied to prevent seizure or discoloration of the surface of the workpiece. The coolant fluid after grinding contains solids such as cutting chips, which are grinding debris, abrasive grains that have peeled off from the grinding wheel (hereinafter collectively referred to as sludge), and impure oils such as lubricating oil and anti-corrosion oil. There is. Continuing to use coolant will cause a decrease in grinding accuracy and, ultimately, a decrease in the quality of workpiece processing.

Therefore, grinding machine tools are equipped with sludge removal equipment to separate and remove solid matter such as sludge contained in coolant fluid, and oil-water separation equipment to remove impure oil. Sludge removal equipment and oil/water separation equipment are required not only for grinding machine tools but also for cutting machine tools.

The numerals used in the explanation of Patent Document 1 below are the numerals used in each patent document.

The cutting fluid impurity removal device 100 shown in Patent Document 1 includes a filtration tank unit 10, a sludge tank unit 20, a backwash tank unit 30, a two-phase separation unit 40, a filter paper supply unit (filter medium traveling means) 50, and a filter paper roll. It is equipped with a filter unit (filtering medium running means) 60, a chamber unit 70, a water pump 80A and a vacuum pump 80B that feed coolant, a switchboard 81, a frame 82 that supports these, and the like (see FIGS. 1 and 2).

A filter paper 200 wound into a roll is attached to the reel 51 of the filter paper supply unit 50. The filter paper 200 pulled out from the reel 51 is wound up on the reel 61 of the filter paper winding unit 60 via the filtration tank unit 10, the sludge tank unit 20, and the backwash tank unit 30 (see FIG. 3).

Patent No. 6865938

In the filtration system of Patent Document 1, the filter paper can be wrapped around less than half of the rotating drum of the filtration unit and the backwash unit, and the filtration capacity cannot be increased.

The present invention was made in order to solve the above-mentioned problems, and it is possible to wrap the filter material around the rotating drum of the filtration unit and the backwash unit almost all the way around, thereby reducing the running speed of the filter material. When the same as before, the filtration capacity is approximately twice that of the conventional one, and when the traveling speed of the filter material is doubled, the filtration time is approximately the same as the conventional one, and the filtration time is halved. Our goal is to provide a filtration system that can.

A filtration system according to a first aspect of the present invention includes a filtration unit and a backwash tank unit as main components.

The filtration unit has a first tank, a first rotating drum that is free to rotate around a horizontal axis in the first tank, and has a mesh and/or slit on substantially the entire surface of the cylindrical part. The first rotary drum has a structure in which the inside and outside of the first rotary drum can communicate with each other, and the inside of the cylindrical drum is made to have a negative pressure by a negative pressure generating means outside the tank, and a continuous filter paper is placed in the cylindrical part so as to cover the mesh and/or the slit. At the same time, the first rotating drum is rotated so that the filter paper runs, and a liquid to be treated containing solids is introduced into the first tank and outside the first rotating drum, and the liquid level is increased. is placed above the first rotating drum, the inside of the cylindrical body is brought under negative pressure by the negative pressure generating means, and the liquid to be treated is passed through the filter paper by a negative pressure suction method to remove solids contained in the liquid to be treated. The liquid to be treated in the first rotating drum from which solids have been captured by the filter paper and has been removed is taken out of the tank.

The backwashing tank unit has a second tank, a second rotating drum that is free to rotate around a horizontal axis within the second tank, and has a mesh and/or slit on substantially the entire surface of the cylindrical part. This structure allows flow to flow between the inside and outside of the second rotary drum, and creates a negative pressure inside the cylindrical body by means of a washing water circulation means having a negative pressure generation function outside the tank, and solids are removed during the filtration process in the filtration unit. The continuous filter paper that has captured is turned upside down and introduced into the second tank, and the filter paper is wound around the cylindrical part so as to cover the mesh and/or slit, and the second rotating drum is caused to rotate together. While running the filter paper, cleaning water returned from the cleaning water circulation means is introduced to the outside of the second rotating drum, and the liquid level is raised above the first rotating drum so that the inside of the second rotating drum is fed. The cleaning water is made to have a negative pressure by the cleaning water circulating means outside the tank, and the cleaning water is passed through the filter paper by a negative pressure suction method, solids are separated and captured from the filter paper, and the filtration function of the filter paper is regenerated, and the filter paper is transferred to the second filter paper. At the same time, the used washing water containing solids in the second rotating drum was taken out of the tank and passed through a solid-liquid separator that separates the solids from the washing water to remove solids. The cleaning water is introduced into the second tank again.

Furthermore, the filtration system according to the first aspect of the present invention has the following characteristic configurations for the filtration unit and the backwash tank unit.

The filtration unit has two winding guide rolls that extend in the axial direction near both sides with the center of the interval located directly above the first rotating drum, and the continuous filter paper is placed between one of the winding guide rolls. is wrapped around the outer circumferential surface of the first rotating drum and then wrapped around the other winding guide roll to lead out of the first tank. A first closing member having an arcuate surface that is the same as the inner diameter of the first closing member is fixed, and the arcuate surface of the first closing member is connected to the mesh and/or the upper side of the first rotating drum around which the continuous filter paper is not wound. Alternatively, the liquid may be placed in sliding contact with the slit portion to prevent the liquid to be treated from entering and maintain a negative pressure inside the first rotating drum.

The backwashing tank unit has two winding guide rolls that extend in the axial direction near both sides with the interval centered at a position directly above the second rotating drum, and the continuous filter paper is wound on one of the winding guide rolls. The second rotary drum is wrapped around a guide roll, then wrapped around the outer circumferential surface of the second rotating drum, and then wrapped around the other winding guide roll to be led out of the second tank. A second closing member having a circular arc surface that is the same as the inner diameter of the rotating drum is fixed, and the circular arc surface of the second closing member is a mesh above the second rotating drum around which the continuous filter paper is not wound. and/or a structure in which the washing water is placed in sliding contact with the slit portion to prevent the washing water from entering and maintain a negative pressure inside the first rotating drum.

In addition to the configuration of the first aspect of the invention, the filtration system according to the second aspect of the invention of the present application further has the following characteristic configurations for the filtration unit and the backwash tank unit. That is,
The first tank has a first fixed shaft that passes through the center of the first rotating drum, passes through end face portions of both ends of the first rotating drum, and is fixed at both ends to a side wall of the first tank. The liquid to be treated inside the tank is suctioned under negative pressure from the outside of the tank through a liquid passage formed from the middle part of the first fixed shaft to the end of the shaft,
The second fixing shaft also includes a second fixed shaft that passes through the center of the second rotating drum, passes through end face portions at both ends of the second rotating drum, and is fixed at both ends to the side wall of the second tank. Cleaning water in the tank is sucked under negative pressure from outside the tank through a liquid passage formed from the middle part of the second fixed shaft to the end of the shaft.

In addition to the configuration of the second invention aspect, the filtration system according to the third invention aspect of the present application further has the following characteristic configurations regarding the filtration unit and the backwash tank unit. That is,
The first closing member is supported by a first support portion provided from the first fixed shaft, and the second closing member is supported by a second support portion provided from the second fixed shaft. Supported by

In addition to the configuration of the third aspect of the invention, the filtration system according to the fourth aspect of the present invention further has the following characteristic configurations for the filtration unit and the backwash tank unit. That is,
It has two first belt tensioning rolls extending in the axial direction at positions sandwiching the first closing member, and further includes a first belt tensioning roll surrounding the first closing member and the two first belt tensioning rolls. 1 endless belt, the first endless belt contacts the inner surface of the first rotating drum, moves as the first rotating drum rotates, and slides with respect to the first closing member. It is designed to
Further, it has two second belt tensioning rolls extending in the axial direction at positions sandwiching the second closing member, and further includes the second closing member and the two second belt tensioning rolls. a second endless belt surrounding the second rotating drum; the second endless belt contacts the inner surface of the second rotating drum and moves with rotation of the second rotating drum; It is designed to slide.

The filtration system according to the fifth invention aspect of the present application has the following characteristic configuration in addition to the configuration of the first invention aspect. That is,
The liquid to be treated that is introduced into the filtration unit is the used coolant liquid in the used coolant liquid storage tank of the machine tool, and the liquid to be treated is the liquid from which solids have been removed and taken out from the first rotating drum to the outside of the tank. The liquid is returned to the machine tool's coolant supply tank for reuse.

A filtration system according to a sixth aspect of the present invention has the following characteristic configuration for the negative pressure generating means in addition to the configuration of the first aspect of the invention. That is,
The negative pressure generating means includes a third tank having a closed structure having a liquid inlet and a liquid outlet at the bottom, and the liquid to be treated in the first rotating drum is introduced into the bottom of the liquid inlet. and the liquid outlet is connected to return it for reuse in the machine tool, and the upper part of the third tank is connected to a vacuum pump, so that the atmospheric pressure at the upper part of the third tank is equal to This is a configuration in which the air pressure is maintained as required lower than the air pressure inside the first rotating drum.

A filtration system according to a seventh aspect of the present invention has the following characteristic configuration for the wash water circulation means in addition to the configuration of the first aspect of the invention. That is,
The washing water circulation means includes a fourth tank having a closed structure having a solid-liquid separation function that separates washing water from solids in the washing water, and used washing water containing solids in the second rotating drum. and a circulation pump that circulates the water through the fourth tank and back to the second tank.

A filtration system according to an eighth aspect of the present invention has the following characteristic configuration for the fourth tank in addition to the configuration of the seventh aspect of the invention. That is,
The fourth tank has a cylindrical upper half and a conical lower half with a larger diameter on the upper side, and an annular plate that corresponds to the boundary between the cylindrical part and the conical part and projects to the inner periphery. The conical part further has one of a liquid inlet and a liquid outlet, the other of the liquid inlet and the liquid outlet has a liquid outlet in the upper part of the cylindrical part, and the solid As a component that exhibits a liquid separation function, the liquid inlet and the liquid outlet are provided tangentially.

A filtration system according to a ninth aspect of the present invention has the following characteristic configuration for the fourth tank in addition to the configuration of the seventh aspect of the invention. That is,
The fourth tank has one or more mesh filters that partition the inside of the tank, a liquid inlet, a liquid outlet, and a drain port located on both sides of the mesh filter, and the fourth tank has a liquid inlet, a liquid outlet, and a drain port located on both sides of the mesh filter. Used washing water containing solids is introduced from the liquid inlet, solid-liquid separated by the mesh filter, and the washing water with solids removed flows out from the liquid outlet, cannot pass through the mesh filter, and settles at the bottom of the tank. When the required amount of solid matter has accumulated, it is removed from the drain port.

A filtration system according to a tenth aspect of the present invention has the following characteristic configuration for the fourth tank in addition to the configuration of the seventh aspect of the invention. That is,
The fourth tank has a magnet roll that rotates in the tank, a doctor blade that comes into sliding contact with the magnet roll, a liquid inlet, a liquid outlet, and a drain port located on both sides of the upper part of the tank, and the second rotating drum The used washing water containing solids is introduced from the liquid inlet, the solids are magnetically attracted by the magnet roll, and the magnetically adsorbed solids are scraped off by the doctor blade and guided to settle at the bottom of the tank for cleaning. Water flows out from the liquid outlet, and when the solid matter that settles at the bottom of the tank has accumulated to a certain extent, it is drained from the drain port.

A filtration system according to an eleventh aspect of the present invention has the following characteristic configuration for the fourth tank in addition to the configuration of the seventh aspect of the invention. That is,
The fourth tank has a cylindrical upper half and a conical lower half with a larger diameter on the upper side, has a liquid inlet at the upper part of the cylindrical part, and has a center of the top surface of the cylindrical part. The lower end of the short pipe penetrating and hanging down into the cylindrical portion is a liquid outlet, and the liquid inlet is provided toward the tangential direction of the cylindrical portion as a component that exhibits the solid-liquid separation function. As a result, the cleaning water flows inward into the tank and flows down to the bottom of the conical part in a spiral shape, leaving solids contained in the cleaning water at the bottom of the conical part, and the cleaning water flows out from the liquid outlet. It is designed to flow out of the tank.

A filtration system according to a twelfth aspect of the invention of the present application has a characteristic configuration in that, in addition to the configuration of the fifth aspect of the invention, it includes the following sludge receiving tank. That is,
In the step before introducing the used coolant liquid into the first tank, the filtration unit is provided with a sludge receiving tank that captures and separates solids larger than the solids captured by the filter paper using a sedimentation action. , the waste sludge receiving tank includes a fifth tank and a mesh filter horizontally suspended in three stages, an upper stage, a middle stage, and a lower stage, in close contact with the inner periphery of the fifth tank, and the size of the mesh is larger than that of the upper stage. is a coarse grade, the lower grade is a fine grade, and the middle grade is a fine grade intermediate between the upper and lower grade, and the above-mentioned use is made at two locations apart from each other above the upper mesh filter of the fifth tank. It has an inlet and an outlet for the coolant liquid.

In addition to the configuration of the twelfth aspect of the invention, the filtration system according to the thirteenth invention aspect of the present application has the following characteristic configuration for the mesh filter of the wastewater receiving tank. That is,
In the mesh filters arranged horizontally in a plurality of stages, the higher the mesh filter is, the larger the mesh is provided.

A filtration system according to a fourteenth invention aspect of the present application has, in addition to the configuration of the twelfth invention aspect, the following characteristic configuration of the mesh filter of the wastewater receiving tank. That is,
The mesh filter horizontally hung in multiple stages has mesh sizes horizontally stacked in three stages: an upper stage, a middle stage, and a lower stage.The upper stage is a coarse grade, the lower stage is a fine grade, and the middle stage is an intermediate grade between the upper and lower stages. The inlet and the outlet are provided at two locations apart from each other above the upper mesh filter of the fifth tank.

In addition to the configuration of the twelfth aspect of the invention, the filtration system according to the fifteenth invention aspect of the present application has the following characteristic configuration for the sludge receiving tank. That is,
The sludge receiving tank includes a fountain pipe in the center of the fifth tank, and a mesh filter above the upper mesh filter, the mesh filter having a mesh size equal to or smaller than the lower mesh filter. The water fountain pipe has a solid matter trapping table held by a body 54b, the water fountain pipe passes through the center of the three-stage mesh filter, the lower end of the pipe is located near the bottom of the tank, and the water fountain pipe is connected to the fifth tank at the lower part of the pipe. Air is flowed in from an air supply pipe of an air supply means provided outside, and as the air rises, solids that settle near the bottom of the tank are sucked up together with washing water and overflowed from the top end of the pipe, and the fine solids are absorbed. The mesh filter of the trapping means is provided surrounding the upper part of the fountain pipe.

A filtration system according to a sixteenth invention aspect of the present application has a characteristic configuration in that, in addition to the configuration of the twelfth invention aspect, it includes the following magnetic adsorption type solid separation device. That is,
A magnetic adsorption type solid separation device is provided downstream of the waste water receiving tank and upstream of the first tank with respect to the flow path of the used coolant, and the magnetic adsorption type solid separation device is configured to rotate. a doctor blade that is in sliding contact with the magnetic roll, and a solid matter recovery tank, and the magnetic roll is made to contact the coolant liquid treated in the sludge receiving tank to collect the solid matter that has magnetic adsorption properties. Further, the doctor blade scrapes off the solid matter adsorbed to the magnetic roll and collects it in the solid matter collection tank.

A filtration system according to a seventeenth invention aspect of the present application has a characteristic configuration in that, in addition to the configuration of the twelfth invention aspect, it includes the following sorting conveyor. That is,
In the step before introducing the used coolant liquid into the first tank, when the used coolant liquid flows down onto a running conveyor belt on the upstream side of the slag receiving tank, lump-like solids are removed from the conveyor belt. It is equipped with a sorting conveyor that can transport and separate the materials.

The filtration system according to the 18th invention aspect of the present application has a characteristic configuration in that, in addition to the configuration of the 5th invention aspect, it includes the following two-phase separation unit. That is,
If the used coolant liquid contains oily impurities, a two-phase separation unit equipped with a hydrophilic oil-repellent filter that divides the inside of the tank into two into a liquid inlet side and a liquid outlet side is provided at a position downstream of the filtration unit. The coolant liquid and oily impurities are separated by the two-phase separation unit.

According to the present invention, it is possible to wrap the filtration material around the rotating drum of the filtration unit and the backwash unit almost all the way around the entire circumference, and when the running speed of the filtration material is the same as that of the conventional one, the speed of the filter material is approximately twice that of the conventional one. It is possible to provide a filtration system that can obtain a high filtration capacity, and can reduce the filtration time by half since it becomes approximately the same as the conventional filtration time when the traveling speed of the filter material is doubled compared to the conventional one.

It is a piping diagram showing the path of coolant liquid in the filtration system according to an embodiment of the present invention. It is a figure showing a filtration unit and a backwash unit which constitute a filtration system concerning an embodiment of the present invention, and a three-dimensional arrangement including each device attached to both units. It is a figure showing a filtration unit and a backwashing unit which constitute a filtration system concerning an embodiment of the present invention. It is a vertical front view showing a filtration unit according to an embodiment of the present invention. 1 is a vertical cross-sectional front view showing a backwashing unit according to an embodiment of the present invention. It is a diagram showing the principle of negative pressure generation means attached to a filtration unit according to an embodiment of the present invention. It is a structure of the external force of the 4th tank which is a component of the wash water circulation device attached to the backwash unit based on embodiment of this invention. It is a diagram showing the principle of a wastewater receiving tank installed in front of a filtration unit according to an embodiment of the present invention. FIG. 8 is a diagram theoretically showing a fourth tank of a modified example that can be replaced with the fourth tank shown in FIG. 7; 8 is a diagram theoretically illustrating another modified example of a fourth tank that can be replaced with the fourth tank shown in FIG. 7. FIG. 8 is a diagram theoretically illustrating another modified example of a fourth tank that can be replaced with the fourth tank shown in FIG. 7. FIG.

Hereinafter, embodiments of the filtration system of the present invention will be described in detail with reference to the drawings.

[Components of the entire system]
As shown in FIG. 1, the filtration system 1 of this embodiment includes a filtration unit 10 and a backwash unit 20 as essential components, and a negative pressure generating means 30 accompanying the filtration unit 10. , has a wash water circulation means 40 attached to the backwash unit 20.

In the filtration system 1, a filtration unit 10 and a backwashing unit 20 are pipe-connected to a used coolant storage tank m1 of a machine tool M, and the used coolant is clarified by removing solids (such as sludge) from the coolant. This system regenerates clear coolant liquid and returns the clear coolant liquid to the coolant liquid supply tank m2 of the machine tool M. The coolant liquid here is assumed to be an aqueous coolant liquid (coolant liquid used by diluting the undiluted solution with water) that is generally used in the field of machine tools.

[Liquid feeding route for liquid to be treated]
The used coolant liquid stored in the used coolant liquid storage tank m1 is sent to the liquid inlet 51a of the fifth tank 51 of the slag receiving tank 50 by the first liquid sending pump 91. The supernatant coolant liquid in the fifth tank 51 flows out from the liquid outlet 51b and is sent to the liquid inlet at the upper part of the magnetic adsorption type solids separation device 60 by the second liquid sending pump 92. The coolant liquid in the lower tank of the magnetic adsorption type solid separation device 60 flows out from the liquid outlet of the lower tank and is sent to the first tank 11 of the filtration unit 10 by the third liquid sending pump 93 . The coolant liquid in the first rotary drum 12 of the filtration unit 10 is transferred to the coolant liquid supply tank of the machine tool M via the third sealed tank 31 constituting the negative pressure generating means 30 by the fourth liquid sending pump 94. The liquid is sent to m2.

[Schematic configuration of the filtration unit 10 and backwash unit 20...FIGS. 2 and 3]
The filtration system 1 runs on the filter medium F by applying negative pressure inside the first rotary drum 12 and the second rotary drum 22, so that the first rotary drum 12 and the second rotary drum 22 are connected to the filter medium F, respectively. It is designed to rotate together due to the adhesion of the two.

The particle size of sludge contained in coolant liquid used in machine tools is approximately 1 μm to several hundred μm. Filter media F includes filter paper, filter cloth (bag-shaped), non-woven filters made by laminating polyester fibers using spinning/drawing technology, sponge mats, wool mats, ceramic filters, back filters, filter media, membrane filters, etc. It can be selected and used as appropriate. The preferred retention particle diameter of the filter paper used in this filtration system 1 is from 1 μm to several hundred μm, more preferably from 1 μm to several tens of μm. Further, a filter material such as a filter cloth (including a bag-shaped filter material) having the same retained particle size as above can also be used.

The nonwoven fabric filter used as the filter material F is made of polyester fibers, for example, and can capture fine particles of 0.1 μm by combining polyester fibers arranged diagonally and in parallel. When polyester fibers are laminated and stretched in an array, it is possible to capture fine particles of 10 μm, and when polyester fibers are laminated and stretched in a disordered manner, it is possible to capture fine particles of 10 μm. It is possible to capture solid matter larger than the μm order, for example, several hundred μmm to 5 mm.

The filtration unit 10 allows the coolant liquid around the drum to pass through the filtration material F due to the negative pressure inside the drum while the filtration material F is wound around the first rotating drum 12 and travels, and also removes solid matter having a size of several hundred microns or less. is adsorbed to the filter medium F under negative pressure, and the clear coolant liquid passing through the filter medium F is taken out and returned to the machine tool M.

The backwashing unit 20 is configured to cause cleaning water around the drum to pass through the filtering material F and adhere to the filtering material F due to the negative pressure inside the drum while the filtering material F is turned upside down and wound around the second rotating drum 22. The filter medium F is regenerated, and the solids are separated in the process of taking the washing water containing the solids out of the tank and circulating it.

In the filtration system 1, ultrafine solids of less than 1 μm to several hundred μm contained in the coolant liquid are filtered using filter paper in a filtration unit 10, and slag is used as a pretreatment to capture larger solids. It is preferable to include a receiving tank 50, and furthermore, it is preferable to include a magnetic adsorption type solid separation device 60 at a position after the waste sludge receiving tank 50.

That is, the filtration system 1 captures solid matter and processed metal powder (polishing powder, grinding powder, or cutting powder) with a size of about 0.1 to 5 mm contained in the used coolant liquid by the waste receiving tank 50, and further , the magnetic metal powder that was not captured in the waste slag receiving tank 50 is captured by the magnetic adsorption type solid separation device 60, and the ultrafine magnetic metal powder that was not captured in the waste slag receiving tank 50 and the magnetic adsorption type solid separation device 60 is captured. And the abrasive powder is captured by the filtration unit 10. Then, in the filtration system 1, a cleaning liquid is passed through the filter paper in the backwashing unit 20 to remove solid matter adhering to the filter paper, thereby making the filter paper capable of filtering again.

The filtration system 1 holds a filter paper roll formed by winding a continuous filter material F with a rotationally driven filter paper delivery shaft 95, delivers the filter material F, winds it around the guide roll 13a, and then rolls the filter paper roll into the first roll of the filtration unit 10. The filter material F is introduced into the tank 11 and wound around the first rotating drum 12 by the two winding guide rolls 14, 14, and then the filter material F led out from the first tank 11 is wound around the guide rolls 13b, 13c and the guide rolls 23a, 23b. The filtration material F is introduced into the second tank 21 by hanging it upside down, and is wound around the second rotating drum 22 by the two winding guide rolls 24, 24. 23c and then wound around the filter paper winding shaft 96. In the filtration system 1, the filtration function of the filter medium F is regenerated by the backwashing unit 20. Therefore, by stopping the operation of the system before the filter paper roll held by the filter paper feed shaft 95 leaves the bobbin, the filter medium F is regenerated. By stopping the feeding of the filter paper and rewinding the filter medium F using the filter paper feeding shaft 95, the filter paper can be used multiple times, for example, 20 to 30 times, without having to reload the filter medium F.

Since the filtration system 1 is realized by wrapping the continuous filter material F around the first rotating drum 12 and the second rotating drum 22 almost all the way around, this is approximately twice the wrapping angle of the conventional method. . Therefore, when the traveling speed of the filter medium F is the same as before (when the rotational speed of the rotating drum is the same as before), the filtration time is approximately twice as long as before, and the solids attached to the filter medium F are The amount of water is approximately twice as high as before, and the filtration capacity is doubled. In addition, since the length of wrapping the filter material F around the first rotating drum 12 and the second rotating drum 22 is approximately twice that of the conventional one, when the traveling speed of the filter material F is doubled compared to the conventional one, Since the filtration time is approximately the same as the conventional method, the filtration time can be reduced to half of the conventional method.

The wash water circulation means 40 includes a fourth tank 41 having a function of separating solids contained in the wash water, but is not limited to the fourth tank 41, and can separate solids contained in the wash water. It is also possible to include any one of a fourth tank 41A, a fourth tank 41B, and a fourth tank 41C, each of which has a separate structure and will be described later.

[Detailed configuration of filtration unit 10...FIGS. 3 and 4]
The filtration unit 10 has a first tank 11 consisting of a cylindrical part and an end plate part, and a first rotating drum 12 that is free to rotate around a horizontal axis within the first tank 11. The cylindrical portion 12a has a mesh and/or slit shape on the entire circumference except for both ends. Thereby, the first rotary drum 12 can have a flow of current between the inside and the outside.

The filtration unit 10 has two winding guide rolls 14, 14 that extend in the axial direction near both sides with the center of the interval located directly above the first rotating drum 12, and the continuous filtration material F is placed on one side. It is wrapped around a winding guide roll 14, then wrapped around the outer peripheral surface of the first rotary drum 12, and then passed around the other winding guide roll 14 to be led out of the first tank 11. A first closing member 15 having a circular arc surface that is the same as the inner diameter of the rotating drum 12 is fixedly installed, and the continuous circular arc surface of the first closing member 15 is attached to the first rotating drum 12 in which the filter material F is not wound. It has a structure in which the liquid to be treated is prevented from entering by being in sliding contact with the upper mesh and/or slit portion, and the inside of the first rotating drum 12 is maintained at a negative pressure.

It has a first fixed shaft 16 that passes through the center of the first rotating drum 12, passes through the end surfaces 12b, 12b at both ends of the first rotating drum 12, and is fixed at both ends to the side wall of the first tank 11. The liquid to be treated in the first tank 11 is suctioned under negative pressure from outside the tank through a liquid passage 16a formed from the middle of the first fixed shaft 16 to the end of the shaft.

The first closing member 15 is supported by a first support portion 16b provided from the first fixed shaft 16.

It has two first belt tensioning rolls 17 and 18 extending in the axial direction at positions sandwiching the first closing member 15, and further includes the first closing member 15 and the two first belt tensioning rolls 17. , 17, the first endless belt 18 contacts the inner surface of the first rotating drum 12 and moves as the first rotating drum 12 rotates, and the first endless belt 18 surrounds the first blockage. It is adapted to slide against the member 15. In this case, the gap between the inner peripheral surface of the first rotating drum 12 and the cylindrical surface of the first closing member 15 is set to the thickness of the first endless belt 18 +, for example, 0-0.2 mm, so that the first It is possible for the endless belt 18 to come into sliding contact with the inner surface of the first rotating drum 12 . In order to set the gap between the inner circumferential surface of the first rotating drum 12 and the cylindrical surface of the first closing member 15 to the thickness of the first endless belt 18 + 0-0.2 mm, for example, the first It is preferable that the length of the support portion 16b can be finely adjusted.

The filtration unit 10 has a continuous filtration material F wound around the cylindrical portion 12a so as to cover the mesh and/or slit, and causes the first rotating drum 12 to rotate together so that the filtration material F travels, and the inside of the first tank 11 is made to rotate. In addition, a liquid to be treated (coolant liquid) containing solids is introduced to the outside of the first rotating drum 12, and the liquid level is raised above the first rotating drum 12, and the inside of the cylindrical body is reduced to a negative pressure by the negative pressure generating means 30. The liquid to be treated is passed through the filter medium F using a negative pressure suction method, and the solids contained in the liquid to be treated are captured by the filter medium F, and the solids are removed from the liquid to be treated in the first rotating drum 12. The liquid is taken out of the tank. The liquid level of the liquid to be treated in the first tank 11 is managed by cooperative control of a high level sensor, a low level sensor, and the amount of liquid supplied by the pump. The mesh has round holes arranged in a regular or oblique row, and preferably has a diameter of 2 mm and a distance of 3 mm between the round holes. When providing slits, it is preferable to have them in a staggered arrangement with a width of 2 mm and a length of 50 mm.

[Negative pressure generating means 30...Figure 6]
The negative pressure generating means 30 includes a third tank 31 with a closed structure having a liquid inlet 31a and a liquid outlet 31b at the bottom, and is configured to introduce the liquid to be treated in the first rotating drum 12 into the bottom of the liquid inlet 31a. The liquid outlet 31b is connected to be returned to the machine tool M for reuse, and the upper part of the third tank 31 is connected to the vacuum pump 32, and the upper part of the third tank 31 is connected to the vacuum pump 32. The air pressure inside the first rotary drum 12 is maintained as required lower than the air pressure inside the first rotating drum 12.

[Detailed configuration of backwash unit 20...FIGS. 3 and 5]
The backwash unit 20 has a similar structure to the filtration unit 10.
The backwashing unit 20 has a second tank 21 and a second rotating drum 22 that is free to rotate around a horizontal axis inside the second tank 21, and has a mesh and/or slit on substantially the entire surface of the cylindrical part 22a. This structure allows flow to flow between the inside and outside of the second rotary drum 22, and a negative pressure is created in the cylindrical body by the cleaning water circulation means 40 having a negative pressure generating function section outside the tank.

The backwashing unit 20 has two winding guide rolls 24 and 24 that extend in the axial direction near both sides with the center of the interval located directly above the second rotary drum 22, and have two winding guide rolls 24 and 24 extending in the axial direction near both sides, and The winding guide roll 24 is used to wrap the drum, and the second rotating drum 22 is wrapped around the outer circumferential surface of the second rotary drum 22 and the other winding guide roll 24 is used to lead out the second tank 21. A second closing member 25 having a circular arc surface that is the same as the inner diameter of the second rotating drum 22 is fixedly installed, and the second rotating drum 22 has a continuous circular arc surface and does not have a filter material F wrapped around it. The second rotary drum 22 has a structure in which the inside of the second rotary drum 22 is maintained at a negative pressure by being in sliding contact with the upper mesh and/or slit portion of the second rotary drum 22 to prevent washing water from entering.

It has a second fixed shaft 26 that passes through the center of the second rotating drum 22, passes through the end surfaces 22b, 22b at both ends of the second rotating drum 22, and is fixed at both ends to the side wall of the second tank 21. The cleaning water in the second tank 21 is sucked under negative pressure from outside the tank through a liquid passage 26a formed from the middle part of the second fixed shaft 26 to the end of the shaft.

The second closing member 25 is supported by a second support portion 26b provided from the second fixed shaft 26.

It has two second belt tensioning rolls 27 and 28 extending in the axial direction at positions sandwiching the second closing member 25, and further includes the second closing member 25 and the two second belt tensioning rolls 27. , 27 , the second endless belt 28 is in contact with the inner surface of the second rotating drum 22 and moves as the second rotating drum 22 rotates, and the second endless belt 28 surrounds the second occlusion. It is adapted to slide against the member 25. In this case, the gap between the inner peripheral surface of the second rotating drum 12 and the cylindrical surface of the second closing member 25 is set to the thickness of the second endless belt 28 +, for example, 0-0.2 mm, so that the second It is possible for the endless belt 28 to come into sliding contact with the inner surface of the second rotating drum 22 . In order to set the gap between the inner peripheral surface of the second rotating drum 22 and the cylindrical surface of the second closing member 25 to the thickness of the second endless belt 28 +, for example, 0-0.2 mm, the second It is preferable that the length of the support portion 26b is adjustable.

The first closing member 15 and the second closing member 25 are made of a plastic material that is flexible, has strong tensile strength, and does not stretch and deform, and is particularly preferably aramid fiber.

[Washing water circulation means 40...Fig. 1, Fig. 7]
The wash water circulation means 40 includes a fourth tank 41 with a closed structure having a solid-liquid separation function that separates the wash water from the solids in the wash water, and a used wash tank 41 containing the solids in the second rotating drum 22. It includes a circulation pump 42 that circulates water through the fourth tank 41 and back to the second tank 21.

The fourth tank 41 has a cylindrical part 41a in its upper half and a conical part 41b in which its lower half has a larger diameter on the upper side, and extends to the inner circumference corresponding to the boundary between the cylindrical part 41a and the conical part 41b. It has an annular plate part 41c, a liquid inlet 41d in the conical part 41b, and a liquid outlet 41e in the upper part of the cylindrical part 41a. 41e is provided toward the tangential direction. As a result, the cleaning water flows inward from the liquid inlet 41d into the bottom of the tank, rises in a spiral shape, and flows out of the tank from the liquid outlet 41e, and solids contained in the cleaning water are removed from the inner surface of the conical part 41b. It rises in a spiral along the direction, contacts the annular plate portion 41c, bounces back, and remains at the bottom of the tank. The solid matter remaining at the bottom of the conical portion 41b is periodically drained. It should be noted that the liquid inlet 41d and the cylindrical portion 41a may be used in a manner in which the inflow and outflow are reversed. In other words, the cylindrical portion 41a may have a liquid inlet, the conical portion 41b may have a liquid outlet at the top, and the liquid inlet and the liquid outlet may be provided in the tangential direction.

The backwashing unit 20 reverses the continuous filtering material F that has captured solid matter during the filtration process in the filtration unit 10 and introduces it into the second tank 21 so that the filtering material F covers the mesh and/or the slit. The filter material F is wound around the cylindrical portion 22a and rotated together with the second rotating drum 22 to run the filter material F, and the washing water returned from the washing water circulation means 40 is introduced to the outside of the second rotating drum 22, and the liquid level is raised to the second level . The inside of the second rotary drum 22 is placed above the second rotary drum 22, and the inside of the second rotary drum 22 is brought under negative pressure by the wash water circulation means 40 outside the tank, and the wash water is passed through the filter medium F by a negative pressure suction method to remove solids from the filter medium. The filtration function of the filter medium F is regenerated, the filter medium F is wound up outside the second tank 21, and the used washing water containing solids in the second rotating drum 22 is taken out of the tank. The solid matter and the wash water are separated and the wash water from which the solid matter is removed is introduced into the second tank 21 again. The liquid level of the cleaning liquid in the second tank 21 is managed by cooperative control of a high level sensor, a low level sensor, and the amount of liquid supplied by the pump.

[Slag receiving tank 50...Figure 8]
The sludge receiving tank 50 captures and separates solids that are larger than the solids captured by the filter medium F in the filtration unit 10 by using a sedimentation action before introducing the used coolant liquid into the first tank 11. be prepared to do so. The waste sludge receiving tank 50 includes a fifth tank 51 and mesh filters 52a, 52b, and 52c horizontally suspended in three stages in close contact with the inner periphery of the fifth tank 51. The mesh filter may be horizontally arranged in one stage, two stages, or four or more stages.

The mesh filters 52a, 52b, and 52c are horizontally suspended in three stages, and the mesh size of the mesh filters is larger in the upper position. For example, the upper mesh filter 52a is a coarse grade that captures solids with a mesh size of 3-5 mm, the middle mesh filter 52b is an intermediate grade that captures solids with a mesh size of 2-3 mm, The lower mesh filter 52c is of a fine grade with a mesh size of 1 to 2 mm to capture solid matter. In the mesh filters arranged horizontally in multiple stages, the size of the mesh is larger in the upper position. Note that the mesh filter may be provided in one or two stages.

The liquid inlet 51a for the used coolant liquid is provided at a required position above the upper mesh filter 52a of the fifth tank 51, and the liquid outlet 51b is provided on the opposite side with respect to the liquid inlet 51a. It is located at the top of the tank. The liquid level of the coolant liquid introduced into the fifth tank 51 is managed by cooperative control of a high level sensor and the pump liquid supply amount so that the level is above the liquid introduction port 51a.

Further, a water fountain pipe 53 is provided at the center of the fifth tank 51, and a mesh filter 54a having a mesh size equal to or smaller than that of the lower mesh filter 52c is mounted above the upper mesh filter 52a on a frame 54b. The fountain pipe 53 passes through the center of the three-stage mesh filter, and the lower end of the pipe is located near the bottom of the tank. Air is caused to flow in from the air supply pipe 55 of the air supply means provided, and as the air rises, solid matter that settles near the bottom of the tank is sucked up together with washing water and overflows from the upper end of the pipe, and the solid matter trapping table 54 A fountain pipe 53 is provided so as to pass through the center. As a result, solid matter having a size of approximately 0.5 to 1.5 mm that settles to the bottom of the tank is captured by the mesh filter 54a.
The sludge receiving tank 50 cannot capture solid matter (sludge) with a size of approximately 1 μm to several hundred μm.

[Magnetic adsorption type solids separation device...Figure 1]
The magnetic adsorption type solid matter separator 60 is provided on the downstream side of the waste water receiving tank 50 and on the upstream side of the first tank 10 with respect to the flow path of the used coolant liquid. The magnetic adsorption type solids separation device 60 has a rotating magnet roll 61, a doctor blade 62 that slides on the magnet roll 61, and a solids recovery tank 63. The coolant liquid is brought into contact with the magnet roll to adsorb solid matter having magnetic adsorption properties, and the solid matter adsorbed on the magnet roll 61 is scraped off with a doctor blade 62 and collected in a solid matter recovery tank 63. The magnetic adsorption type solid separation device 60 is a commercially available product.

[Drain of each tank]
Drain ports are provided at the lower ends of the first to fifth tanks 11, 21, 31, 41, and 51, respectively, and drain valves 81, 82, 83, 84, and 85 that are manually opened and closed are provided at each drain port. A drain pipe on the downstream side of each drain valve is connected to a sludge tank 86 (prepared at the factory).

[Modified example]
[Modification 1 regarding the fourth tank 41]
In place of the fourth tank 41 shown in FIG. 7, a fourth tank 41A shown in FIG. 9 may be provided. The fourth tank 41A has one or more mesh filters 41f that partition the inside of the tank, a liquid inlet 41g, a liquid outlet 41h, and a drain port 41i located on both sides of the mesh filter 41f, and a second rotating drum. The used washing water containing solids in the liquid inlet 22 is introduced from the liquid inlet 41g and separated into solid and liquid by the mesh filter 41f, and the washing water with the solids removed flows out from the liquid outlet 41h and cannot pass through the mesh filter 41f. When the solid matter that settles at the bottom of the tank has accumulated to the required level, it is removed from the drain port 41i.

[Modification 2 regarding the fourth tank 41]
In place of the fourth tank 41 shown in FIG. 7, a fourth tank 41B shown in FIG. 10 may be provided. The fourth tank 41B has a magnet roll 41j rotating in the tank, a doctor blade 41k slidingly in contact with the magnet roll 41j, a liquid inlet 41m, a liquid outlet 41n, and a drain port 41p located on both sides of the upper part of the tank. The used washing water containing solids in the rotating drum 22 of No. 2 is introduced from the liquid inlet 41m, the solids are magnetically attracted by a magnet roll 41j, and the magnetically attracted solids are scraped off with a doctor blade 41k and settled at the bottom of the tank. The cleaning water flows out from the liquid outlet 41n, and is drained from the drain port 41p when the required amount of solid matter that settles at the bottom of the tank has accumulated.

[Modification 3 regarding fourth tank 41]
In place of the fourth tank 41 shown in FIG. 7, a fourth tank 41C shown in FIG. 11 may be provided. The fourth tank 41C has a cylindrical part 41a in its upper half and a conical part 41b in which its lower half has a larger diameter on the upper side, and has a liquid inlet 41q at the upper part of the cylindrical part 41a. The center of the top surface is a liquid outlet 41r, and the lower end of a large-diameter hanging pipe 41s hanging from the top surface into the tank is open. Since it is provided in the tangential direction of the portion 41a, the cleaning water flows into the tank in the inner circumferential direction and flows down in a spiral shape to the bottom of the conical portion 41b, thereby removing solids contained in the cleaning water from the conical portion 41b. The cleaning water is left at the bottom of the tank, and the cleaning water flows out of the tank from the liquid outlet 41r. When the solid matter that settles at the bottom of the tank has accumulated to the required level, it is removed from the drain port 41t.

[Addition of chip separation conveyor]
The piping system diagram of the filtration system 1 shown in FIG. 1 does not include a chip separation conveyor. However, when the machine tool M that performs cutting discharges a large amount of chips that are larger than the appropriate size of solid matter to be captured in the waste slag receiving tank 50, the filtration system 1 It is preferable that a separation conveyor for separating and removing chips contained in the used coolant liquid be arranged between the waste coolant tank 50 and the slag receiving tank 50. The separation conveyor is disposed upstream of the slag receiving tank 50 before introducing the used coolant liquid into the first tank 10, and when the used coolant liquid flows down onto the running conveyor belt, it becomes solid solids. It is equipped with a sorting conveyor that can transport and separate items using a conveyor belt.

[Addition of two-phase separation unit]
When the used coolant liquid contains oily impurities, the filtration system 1 is preferably configured such that a two-phase separation unit is disposed downstream of the filtration unit 10. Although not included in the piping system diagram of FIG. 1, if the used coolant liquid contains oily impurities, a two-phase separation unit shall be provided. The two-phase separation unit is equipped with a hydrophilic oil-repellent filter that divides the inside of the tank into two into a liquid inlet side and a liquid outlet side in the form of a vertical wall, which is placed after the filtration unit 10, and the coolant liquid is passed through the hydrophilic oil-repellent filter. , oily impurities are captured by a hydrophilic oleophobic filter.

In the embodiment described above, the present invention was applied to a device for removing solid impurities from a coolant liquid used in a machine tool, but the filtration system of the present application can be applied to various aqueous liquids such as industrial wastewater and domestic wastewater. It can be widely used as a device for removing contained solid impurities and oily impurities. In that case, it is only necessary to replace the filter material depending on the type of solid impurity or oily impurity, so there is no need to replace mechanical parts.

DESCRIPTION OF SYMBOLS 1... Filtration system 10... Filtration unit 11... First tank 12... First rotating drum 12a... Cylindrical part 12b... End surface part 13a, 13b, 13c... Guide roll 14... Winding guide roll 15... First closing member 16 ...First fixed shaft 16a...Liquid passage 16b...First support part 17...First belt tension roll 18...First endless belt 20...Backwashing unit 21...Second tank 22...Second rotating drum 22a...Cylindrical part 22b...End face part 23a, 23b, 23c...Guide roll 24...Wrap guide roll 25...Second closing member 26...Second fixed shaft 26a...Liquid passage 26b...Second support part 27...First Belt tension roll 28...Second endless belt 30...Negative pressure generating means 31...Third closed tank 31a...Liquid inlet 31b...Liquid outlet 32...Vacuum pump 40...Washing water circulation means 41, 41A, 41B, 41C...No. 4 tank 41a... Cylindrical part 41b... Conical part 41c... Annular plate part 41d... Liquid inlet 41e... Liquid outlet 41f... Mesh filter 41g... Liquid inlet 41h... Liquid outlet 41i... Drain port 41j... Magnet roll 41k... Doctor blade 41m ...Liquid inlet 41n...Liquid outlet 41p...Drain port 41q...Liquid inlet 41r...Liquid outlet 42...Circulation pump 50...Slag receiving tank 51...Fifth tank 51a...Liquid inlet 51b...Liquid discharge port 52a, 52b, 52c... Mesh filter 53... Fountain pipe 54... Solid matter capturing table 54a... Mesh filter 54b... Frame body 55... Air supply pipe 60... Magnetic adsorption type solid matter separation device 61... Magnet roll 62... Doctor blade 63... Solid matter collection tank 81, 82, 83, 84, 85... Drain valve 86... Sludge tank 91... First liquid feeding pump 92... Second liquid feeding pump 93... Third liquid feeding pump 94... Fourth liquid feeding pump 95... Filter paper feeding Shaft 96... Filter paper winding shaft F... Filter paper M... Machine tool m1... Used coolant liquid storage tank m2... Coolant liquid supply tank

Claims (18)

a first tank, and a first rotating drum that is free to rotate around a horizontal axis in the first tank, and has a mesh and/or slit on substantially the entire surface of the cylindrical part, thereby controlling the first rotation. The drum has a structure in which flow can flow between the inside and outside of the drum, and a negative pressure is created in the cylindrical body by a negative pressure generating means outside the tank, and a continuous filter material is wound around the cylindrical part so as to cover the mesh and/or the slit. The first rotating drum is rotated together to run the filter material, and a liquid to be treated containing solids is introduced into the first tank and outside the first rotating drum, and the liquid level is raised to the above level. The cylindrical body is placed above the first rotating drum, and the inside of the cylindrical body is made to have a negative pressure by the negative pressure generating means, and the liquid to be treated is caused to flow through the filter medium by a negative pressure suction method to remove solids contained in the liquid to be treated. a filtration unit that takes out the liquid to be treated in the first rotating drum from which solids have been captured by the filter medium to the outside of the tank;
a second tank, and a second rotating drum that is free to rotate around a horizontal axis in the second tank, and has a mesh and/or slit on substantially the entire surface of the cylindrical part, thereby controlling the second rotation. The drum has a structure in which the inside and outside of the drum can communicate with each other, and a negative pressure is created in the cylindrical body by a washing water circulation means having a negative pressure generation function section outside the tank, and the continuous filter that captures solids during the filtration process in the filtration unit The filtering material is turned upside down and introduced into the second tank, and the filtering material is wound around the cylindrical part so as to cover the mesh and/or the slit, and the second rotating drum is rotated together to remove the filtering material. While running, cleaning water returned from the cleaning water circulation means is introduced to the outside of the second rotating drum, and the liquid level is raised above the second rotating drum so that the inside of the second rotating drum is drained outside the tank. The washing water is made to have a negative pressure by the washing water circulation means, and the washing water is made to flow through the filtering material by a negative pressure suction method, solid matter is separated and captured from the filtering material, and the filtration function of the filtering material is regenerated. The used washing water containing solids in the second rotating drum is taken out of the tank and passed through a solid-liquid separator that separates the solids from the washing water to remove solids. and a backwash tank unit that reintroduces the washed water into the second tank,
Furthermore, the filtration unit has two winding guide rolls that extend in the axial direction near both sides with the interval centered at a position directly above the first rotating drum, and the continuous filtration material is The first drum is wrapped around a winding guide roll, then wrapped around the outer peripheral surface of the first rotary drum, and then passed around the other winding guide roll to be led out of the first tank. A first closing member having the same arcuate surface as the inner diameter of the rotating drum is fixedly installed in the first rotating drum at a position sandwiched between a pair of first belt tensioning rolls , and the first closing member The arcuate surface is in sliding contact with the upper mesh and/or slit portion of the first rotating drum around which the continuous filter material is not wound, thereby preventing the liquid to be treated from entering the drum. It has a structure that maintains negative pressure inside the first rotating drum,
Further, the backwashing tank unit has two winding guide rolls extending in the axial direction near both sides with the center of the interval located directly above the second rotating drum, and the continuous filtering material is fixed to one side. The material is wrapped around the wrapping guide roll of the drum, and then wrapped around the outer circumferential surface of the second rotary drum, and is led out of the second tank by being wrapped around the other wrapping guide roll. A second closing member having the same arcuate surface as the inner diameter of the second rotating drum is fixedly installed in the second rotating drum at a position sandwiched between the pair of second belt tensioning rolls , and The arcuate surface of the closing member is brought into sliding contact with the upper mesh and/or slit portion of the second rotating drum where the continuous filter material is not wound, thereby preventing the intrusion of the cleaning water. A filtration system characterized by having a structure that maintains negative pressure inside the second rotating drum. The first tank has a first fixed shaft that passes through the center of the first rotating drum, passes through end face portions of both ends of the first rotating drum, and is fixed at both ends to a side wall of the first tank. The liquid to be treated inside the tank is suctioned under negative pressure from the outside of the tank through a liquid passage formed from the middle part of the first fixed shaft to the end of the shaft,
The second fixing shaft also includes a second fixed shaft that passes through the center of the second rotating drum, passes through end face portions at both ends of the second rotating drum, and is fixed at both ends to the side wall of the second tank. 2. The filtration system according to claim 1, wherein the cleaning water in the tank is sucked under negative pressure from outside the tank through a liquid passage formed from the middle part of the second fixed shaft to the end of the shaft. The first closing member is supported by a first support part provided from the first fixed shaft,
The filtration system according to claim 2, wherein the second closing member is supported by a second support section provided from the second fixed shaft. It has two first belt tensioning rolls extending in the axial direction at positions sandwiching the first closing member, and further includes a first belt tensioning roll surrounding the first closing member and the two first belt tensioning rolls. 1 endless belt, the first endless belt contacts the inner surface of the first rotating drum, moves as the first rotating drum rotates, and slides with respect to the first closing member. It is designed to
Further, it has two second belt tensioning rolls extending in the axial direction at positions sandwiching the second closing member, and further includes the second closing member and the two second belt tensioning rolls. a second endless belt surrounding the second rotating drum; the second endless belt contacts the inner surface of the second rotating drum and moves with rotation of the second rotating drum; 4. The filtration system of claim 3, wherein the filtration system is adapted to slide. The liquid to be treated that is introduced into the filtration unit is the used coolant liquid in the used coolant liquid storage tank of the machine tool, and the liquid to be treated is the liquid from which solids have been removed and taken out of the tank from the inside of the first rotating drum. 2. The filtration system of claim 1, wherein liquid is returned to the machine tool coolant supply tank for reuse. The negative pressure generating means includes a third tank having a closed structure having a liquid inlet and a liquid outlet at the bottom, and the liquid to be treated in the first rotating drum is introduced into the bottom of the liquid inlet. and the liquid outlet is connected to return it for reuse in the machine tool, and the upper part of the third tank is connected to a vacuum pump, so that the atmospheric pressure at the upper part of the third tank is 6. The filtration system according to claim 5, wherein the filtration system is configured to maintain a required lower air pressure than the air pressure within the first rotating drum. The washing water circulation means includes a fourth tank having a closed structure having a solid-liquid separation function that separates washing water from solids in the washing water, and used washing water containing solids in the second rotating drum. The filtration system according to claim 5, further comprising a circulation pump that circulates the water through the fourth tank and back to the second tank. The fourth tank has a cylindrical upper half and a conical lower half with a larger diameter on the upper side, and an annular plate that corresponds to the boundary between the cylindrical part and the conical part and projects to the inner periphery. and further has a liquid inlet or a liquid outlet in the conical part, and when the conical part has a liquid inlet, a liquid outlet in the upper part of the cylindrical part , and a liquid outlet in the conical part. 8. The liquid inlet has a liquid inlet at the upper part of the cylindrical part , and the liquid inlet and the liquid outlet are provided in a tangential direction as a component that exhibits the solid-liquid separation function. filtration system. The fourth tank has one or more mesh filters that partition the inside of the tank, a liquid inlet, a liquid outlet, and a drain port located on both sides of the mesh filter, and the fourth tank has a liquid inlet, a liquid outlet, and a drain port located on both sides of the mesh filter. Used washing water containing solids is introduced from the liquid inlet, solid-liquid separated by the mesh filter, and the washing water with solids removed flows out from the liquid outlet, cannot pass through the mesh filter, and settles at the bottom of the tank. 8. The filtration system according to claim 7, wherein the solid matter is removed from the drain port when a required amount of solid matter has accumulated. The fourth tank has a magnet roll that rotates in the tank, a doctor blade that comes into sliding contact with the magnet roll, a liquid inlet, a liquid outlet, and a drain port located on both sides of the upper part of the tank, and the second rotating drum The used washing water containing solids is introduced from the liquid inlet, the solids are magnetically attracted by the magnet roll, and the magnetically adsorbed solids are scraped off by the doctor blade and guided to settle at the bottom of the tank for cleaning. 8. The filtration system according to claim 7, wherein the water flows out from the liquid outlet and is drained from the drain port when a required amount of solid matter has accumulated at the bottom of the tank. The fourth tank has a cylindrical upper half and a conical lower half with a larger diameter on the upper side, has a liquid inlet at the upper part of the cylindrical part, and has a center of the top surface of the cylindrical part. The lower end of the short pipe penetrating and hanging down into the cylindrical portion is a liquid outlet, and the liquid inlet is provided toward the tangential direction of the cylindrical portion as a component that exhibits the solid-liquid separation function. As a result, the cleaning water flows inward into the tank and flows down to the bottom of the conical part in a spiral shape, leaving solids contained in the cleaning water at the bottom of the conical part, and the cleaning water flows out from the liquid outlet. 8. The filtration system of claim 7, wherein the filtration system is adapted to flow out of the tank. In the step before introducing the used coolant liquid into the first tank, the filtration unit is provided with a sludge receiving tank that captures and separates solids larger than solids captured by the filter medium using sedimentation action. The sludge receiving tank includes a fifth tank and a mesh filter horizontally suspended in three stages, an upper stage, a middle stage, and a lower stage, in close contact with the inner periphery of the fifth tank, and the size of the mesh is The upper row is a coarse grade, the lower row is a fine grade, and the middle row is a grade intermediate between the upper and lower rows, and the above-mentioned use is performed at two locations apart from each other above the upper mesh filter of the fifth tank. 6. The filtration system according to claim 5, further comprising an inlet and an outlet for a coolant. 13. The filtration system according to claim 12, wherein the mesh filters arranged horizontally in multiple stages have larger meshes at higher positions. The mesh filter horizontally hung in multiple stages has mesh sizes horizontally stacked in three stages: an upper stage, a middle stage, and a lower stage.The upper stage is a coarse grade, the lower stage is a fine grade, and the middle stage is an intermediate grade between the upper and lower stages. 13. The filtration system according to claim 12, wherein the inlet and the outlet are provided at two locations apart from each other above the upper mesh filter of the fifth tank. The sludge receiving tank includes a fountain pipe in the center of the fifth tank, and a mesh filter above the upper mesh filter, the mesh filter having a mesh size equal to or smaller than the lower mesh filter. The water fountain pipe has a solid matter trapping table held by a body 54b, the water fountain pipe passes through the center of the three-stage mesh filter, the lower end of the pipe is located near the bottom of the tank, and the water fountain pipe is connected to the fifth tank at the lower part of the pipe. Air is flowed in from an air supply pipe of an air supply means provided outside, and as the air rises, solids that settle near the bottom of the tank are sucked up and overflowed from the top end of the pipe along with washing water, and the solids are captured. 13. The filtration system according to claim 12, further comprising a fountain pipe 53 passing through the center of the table. A magnetic adsorption type solid separation device is provided downstream of the waste water receiving tank and upstream of the first tank with respect to the flow path of the used coolant, and the magnetic adsorption type solid separation device is configured to rotate. a doctor blade that is in sliding contact with the magnetic roll, and a solid matter recovery tank, and the magnetic roll is made to contact the coolant liquid treated in the sludge receiving tank to collect the solid matter that has magnetic adsorption properties. 13. The filtration system according to claim 12, wherein the solid matter adsorbed to the magnet roll is further scraped off by the doctor blade and collected in the solid matter recovery tank. In the step before introducing the used coolant liquid into the first tank, when the used coolant liquid flows down onto a running conveyor belt on the upstream side of the slag receiving tank, lump-like solids are removed from the conveyor belt. 13. The filtration system according to claim 12, further comprising a sorting conveyor capable of transporting and separating. If the used coolant liquid contains oily impurities, a two-phase separation unit equipped with a hydrophilic oil-repellent filter that divides the inside of the tank into two into a liquid inlet side and a liquid outlet side is provided at a position downstream of the filtration unit. 6. The filtration system according to claim 5, wherein the two-phase separation unit separates the coolant liquid and oily impurities.

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